Mode of rolling bars for angle-iron



(No Model.) 3 2 Sheet s$heet 1.

J. M. BAKER.

MODE OF ROLLING BARS FOR ANGLE IRON. No. 374,770. Patented Dec. 13, 1887.

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I J. M. BAK ER. MODE- 0F ROLLING BARS FOR-ANGLE IRON. No. 374,770. Patented Dec. 13, 1887.

' UNITED STATES PATENT Fries.

JOHN M. BAKER, OF ALLENTOWN, PENNSYLVANIA.

MODE OF ROLL ING BARS FOR ANGLE-IRON.

SEPECIIE'ICATION forming part of Letters Patent No. 374,770, dated December 13, 1887.

Application filed August 19, 1887. Serial No. 247,326. (No model.)

To aZZ- whom it may concern:

' Be it known that I, JOHN M.BAKER,a citizen of the United States, and a resident of Allentown, Lehigh county, Pennsylvania, have invented certain Improvements in Rolling Angle-Bars, of which the following is a specification.

The object of my invention is to so roll an angle-bar as to insure the proper formation of the root of theangle without straining, distorting, or breaking the bar, and this object I attain in the manner which I will now proceed to describe, referencebeing had to the accompanying drawings, in which- Figure 1 is a series of diagrams illustrating the successive passes in the ordinary operation of rolling an angle-bar. Fig. 2 is a series of diagrams illustrating my invention, and Fig. 3 is a side view of aset of rolls constructed for carrying out my invention.

The usual operations in the rolling of an angle-bar may be divided into the preliminary or preparatory series and the final or finishing series. Thus in the diagram, Fig. 1, the preliminary series, w, includes the four successive passes 1, 2, 3, and 4, while the final or finishing series, includes the four successive passes 5, 6, 7, and 8, both series being flat passes, and the effect of the preparatory series being to reduce the square billet to the form of an oblong rectangular bar, while the finishing series transforms this into a bar with flanges at an angle to each other. The objection to this method of rolling is that in making the first angle pass, 5, the central portion of the oblong rectangular bar resulting from pass 4. bridges the recess 10 in the bottom roll for said pass 5,

and there is hence no direct draft upon this portion of the bar, while the portions of the bar on each side of the center are subjected to excessive draft,and consequent elongation, the

unequal strain upon the bar being sufficient in some cases to tear said bar apart. In order to overcome this objection, I subject the bar to an edge pass, a, Fig. 2, after said bar has made the pass 4-that is to say, the last of the preparatory passesand before it makes the pass 5, which is the first of the final or finishing passes. The rolls through which this intermediate pass, a, is made are such that the billet will be reduced from the rectangular form given it by the pass 4 and will have a V-shaped face imparted to it, this V-shaped face forming the outer part of the root of the angle, so that when the bar is subjected to the pass 5 this root will enter the recess win the lower roll and there will be no unequal strain or draft upon the bar, all portions of the surface of the same being subjected to like action.

Owing to the fact that the pass (6 is an edge pass and the V shape of said pass is at one side, the metal of the bar will readily assume this form, owing to its natural tendency to expand laterally when subjected to pressure above and below.

In order to start the inside of theroot of the angle, I prefer to form in the top of thebarin making the pass 4. a groove, 9, which is not completely rolled out in making the interme diate edge pass,a,thisgroovehavingthefurther effect of preventing the formation ofa fin upon the side of the billet during this intermediate pass.

In Fig. 3 I have shown a set of rolls, A, B, and D, constructed to form the preparatory passes 1, 2, 3, and 4 for the billet, the intermeto, however, if desired. The upper roll, A, of

the set has grooves of less depth than the intermediate and lower rolls, B and D, so that the upper and intermediate rolls form passes a, b, c, d, and c, which are adapted for the production of blanks for the manufacture of angle-bars having unequal flanges, the passes a b c, &c., producing blanks for bars with flanges of equal size. In the groove of the upper roll, A, which forms'part of the pass 4, is a fillet, 10, which serves to form the groove 9 in the bar during said pass. The rolls have grooves for additional passes, 11, 12, 13, and 14, which may be used for the preliminary passes in rolling bars of the smaller sizes.

Although I prefer to form the intermediate edge passes by the same rolls which form the preparatory passes, it will be evident that the intermediate edge passes may be formed by the finishing-rolls or by a separate set of rolls without departing from my invention.

I claim as my invention I 1. The within described improvement in rolling angle-bars, which consists insubj ecting the bar resulting from the preparatory passes to an edge pass for forming the root ofthe angle before subjecting the bar to the final or finishing passes, all substantially as specified.

2. The within described improvement in rolling anglebars, which consists in subjecting the bar to a series of preparatory passes, the last of which grooves the bar, then subjecting said grooved bar to an intermediate edge pass, which forms the root of the angle, and then subjecting the bar to the final or finishing passes, all substantially as specified.

3. A set of rolls grooved to form a series of fiat passes for a bar and an edge pass for forming the root of an angle on the bar, all substantially as specified.

4. A set of rolls grooved-to form a series of flat passes for abar and anumber of edge passes for forming the root of an angle on difl'erent 25 sizes of bars, all substantially as specified.

5. A set of rolls grooved to form a series of flat passes for a bar and a number of edge passes, each adapted to form the root of an angle on a bar, some of said edge passes being 30 for even bars and others for uneven bars, all substantially as specified.

In testimony whereof I have signed my name to this specification in the presenceof two subscribing witnesses.

JOHN M. BAKER.

\Vitnesses: I

E. LEHMAN Bums, THOMAS LEES. 

